2018-04-12 19:53:50 +02:00
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{- This code was authored by:
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Stephen Diehl
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Kwang Yul Seo <kwangyul.seo@gmail.com>
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It was made available under the MIT license. See the src/Nix/Type
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directory for more details.
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-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE FlexibleInstances #-}
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{-# LANGUAGE LambdaCase #-}
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{-# LANGUAGE MultiWayIf #-}
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{-# LANGUAGE CPP #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE TypeApplications #-}
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{-# LANGUAGE TypeSynonymInstances #-}
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{-# OPTIONS_GHC -Wno-unused-matches #-}
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{-# OPTIONS_GHC -Wno-unused-imports #-}
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module Repl where
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2018-11-19 00:32:03 +01:00
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import Nix hiding (exec, try)
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import Nix.Convert
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import Nix.Eval
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import Nix.Scope
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import qualified Nix.Type.Env as Env
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import Nix.Type.Infer
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import Nix.Utils
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import qualified Data.HashMap.Lazy as M
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import Data.List (isPrefixOf, foldl')
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import qualified Data.Map as Map
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import Data.Monoid
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import Data.Text (unpack, pack)
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import qualified Data.Text as Text
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import qualified Data.Text.IO as Text
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import Data.Version (showVersion)
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import Paths_hnix (version)
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import Control.Monad.Catch
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import Control.Monad.Identity
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import Control.Monad.Reader
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import Control.Monad.State.Strict
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import System.Console.Haskeline.MonadException
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import System.Console.Repline
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import System.Environment
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import System.Exit
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main :: (MonadNix e m, MonadIO m, MonadException m) => m ()
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main = flip evalStateT initState $
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#if MIN_VERSION_repline(0, 2, 0)
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evalRepl (return prefix) cmd options (Just ':') completer welcomeText
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#else
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evalRepl prefix cmd options completer welcomeText
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#endif
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where
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prefix = "hnix> "
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welcomeText = liftIO $ putStrLn $ "Welcome to hnix " <> showVersion version <> ". For help type :help\n"
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-------------------------------------------------------------------------------
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-- Types
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-------------------------------------------------------------------------------
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newtype IState m = IState
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{ tmctx :: AttrSet (NValue m) -- Value environment
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}
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initState :: MonadIO m => IState m
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initState = IState M.empty
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type Repl e m = HaskelineT (StateT (IState m) m)
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hoistErr :: MonadIO m => Result a -> Repl e m a
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hoistErr (Success val) = return val
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hoistErr (Failure err) = do
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liftIO $ print err
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abort
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-------------------------------------------------------------------------------
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-- Execution
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-------------------------------------------------------------------------------
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exec :: forall e m. (MonadNix e m, MonadIO m, MonadException m)
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=> Bool -> Text.Text -> Repl e m (NValue m)
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exec update source = do
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-- Get the current interpreter state
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st <- get
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-- Parser ( returns AST )
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-- TODO: parse <var> = <expr>
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expr <- hoistErr $ parseNixTextLoc source
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-- Type Inference ( returns Typing Environment )
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-- tyctx' <- hoistErr $ inferTop (tyctx st) expr
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-- TODO: track scope with (tmctx st)
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mVal <- lift $ lift $ try $ pushScope @(NThunk m) M.empty (evalExprLoc expr)
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case mVal of
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Left (NixException frames) -> do
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lift $ lift $ liftIO . print =<< renderFrames @(NThunk m) frames
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abort
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Right val -> do
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-- Update the interpreter state
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when update $ do
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-- Create the new environment
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put st { tmctx = tmctx st -- TODO: M.insert key val (tmctx st)
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}
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return val
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cmd :: (MonadNix e m, MonadIO m, MonadException m) => String -> Repl e m ()
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cmd source = do
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val <- exec True (Text.pack source)
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lift $ lift $ do
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opts :: Nix.Options <- asks (view hasLens)
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if | strict opts ->
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liftIO . print . prettyNValueNF =<< normalForm val
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| values opts ->
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liftIO . print =<< prettyNValueProv val
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| otherwise ->
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liftIO . print =<< prettyNValue val
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-------------------------------------------------------------------------------
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-- Commands
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-------------------------------------------------------------------------------
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-- :browse command
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browse :: MonadNix e m => [String] -> Repl e m ()
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browse _ = do
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st <- get
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undefined
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-- liftIO $ mapM_ putStrLn $ ppenv (tyctx st)
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-- :load command
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load :: (MonadNix e m, MonadIO m, MonadException m) => [String] -> Repl e m ()
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load args = do
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contents <- liftIO $ Text.readFile (unwords args)
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void $ exec True contents
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-- :type command
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typeof :: (MonadNix e m, MonadException m, MonadIO m) => [String] -> Repl e m ()
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typeof args = do
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st <- get
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val <- case M.lookup line (tmctx st) of
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Just val -> return val
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Nothing -> exec False line
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liftIO $ putStrLn $ describeValue $ valueType (_baseValue val)
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where
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line = Text.pack (unwords args)
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-- :quit command
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quit :: (MonadNix e m, MonadIO m) => a -> Repl e m ()
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quit _ = liftIO exitSuccess
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-------------------------------------------------------------------------------
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-- Interactive Shell
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-------------------------------------------------------------------------------
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-- Prefix tab completer
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defaultMatcher :: MonadIO m => [(String, CompletionFunc m)]
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defaultMatcher = [
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(":load" , fileCompleter)
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--, (":type" , values)
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]
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-- Default tab completer
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comp :: Monad m => WordCompleter m
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comp n = do
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let cmds = [":load", ":type", ":browse", ":quit"]
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-- Env.TypeEnv ctx <- gets tyctx
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-- let defs = map unpack $ Map.keys ctx
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return $ filter (isPrefixOf n) (cmds {-++ defs-})
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options :: (MonadNix e m, MonadIO m, MonadException m)
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=> [(String, [String] -> Repl e m ())]
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options = [
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("load" , load)
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--, ("browse" , browse)
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, ("quit" , quit)
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, ("type" , typeof)
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, ("help" , help)
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]
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help :: forall e m . (MonadNix e m, MonadIO m, MonadException m)
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=> [String] -> Repl e m ()
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help _ = liftIO $ do
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putStrLn "Available commands:\n"
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mapM_ putStrLn $ map fst (options @e @m)
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completer :: (MonadNix e m, MonadIO m) => CompleterStyle (StateT (IState m) m)
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completer = Prefix (wordCompleter comp) defaultMatcher
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